CN217387163U

CN217387163U - Display substrate and display device

Info

Publication number: CN217387163U
Application number: CN202220609168.2U
Authority: CN
Inventors: 代青
Original assignee: BOE Technology Group Co Ltd
Current assignee: BOE Technology Group Co Ltd
Priority date: 2022-03-21
Filing date: 2022-03-21
Publication date: 2022-09-06
Anticipated expiration: 2032-03-21

Abstract

The disclosure provides a display substrate and a display device. Wherein, the display substrate includes a plurality of sub-pixels, and this display substrate includes: the pixel structure comprises a substrate and a pixel limiting layer arranged on one side of the substrate, wherein the pixel limiting layer is used for forming an opening area of a sub-pixel, and the opening area is provided with a long side and a short side; the plurality of sub-pixels comprise a first sub-pixel and a second sub-pixel which have the same color and are adjacent to each other, the opening area of the first sub-pixel is a first opening area, the first opening area is provided with a first long edge, the opening area of the second sub-pixel is a second opening area, and the second opening area is provided with a first short edge; the first long side is at least partially adjacent to the first short side, and the height of the pixel defining layer between the first opening area and the second opening area is at least smaller than the height of other at least partial pixel defining layers.

Description

Display substrate and display device

Technical Field

The present disclosure relates to the field of display technologies, and in particular, to a display substrate and a display device.

Background

Organic Light-Emitting diodes (OLEDs) have the advantages of self-luminescence, wide viewing angle, fast response time, high Light-Emitting efficiency, low operating voltage, and simple process, and are known as the next generation of "star" Light-Emitting devices.

Quantum Dot Light Emitting Diodes (QLEDs) have a narrower emission spectrum, a purer display color and a wider color gamut, so the QLEDs are also paid attention to the display industry and become a powerful candidate for the next generation of display technology.

SUMMERY OF THE UTILITY MODEL

The present disclosure provides a display substrate including a plurality of sub-pixels, the display substrate including:

a substrate, and a pixel defining layer disposed at one side of the substrate, the pixel defining layer for forming an opening region of the sub-pixel, the opening region having a long side and a short side;

the plurality of sub-pixels comprise a first sub-pixel and a second sub-pixel which are same in color and adjacent to each other, an opening area of the first sub-pixel is a first opening area, the first opening area is provided with a first long side, an opening area of the second sub-pixel is a second opening area, and the second opening area is provided with a first short side; the first long side is at least partially adjacent to the first short side, and the height of a pixel defining layer between the first opening area and the second opening area is at least smaller than the height of other at least partial pixel defining layers.

In an optional implementation manner, an orthographic projection of the second opening region in the first direction is located within an orthographic projection range of the first opening region in the first direction;

wherein the first direction is perpendicular to a long side of the second opening region.

In an alternative implementation, an included angle between the first long side and the long side of the second opening region is greater than or equal to 45 ° and less than or equal to 135 °.

In an alternative implementation, the included angle is greater than or equal to 70 ° and less than or equal to 110 °.

In an alternative implementation, the first long side and the first short side are parallel to each other.

In an alternative implementation manner, the first opening region has a second short side, the second opening region has a second long side, and the second long side and the second short side are parallel to each other or on the same straight line.

In an alternative implementation manner, the first opening region has a second short side and a third short side which are opposite, the second opening region has a second long side and a third long side which are opposite, and the distance between the second short side and the second long side is smaller than or equal to the distance between the third short side and the third long side;

the first sub-pixel and the second sub-pixel form a periodic unit, the periodic units are periodically arranged along a second direction, two adjacent periodic units comprise a first periodic unit and a second periodic unit, and the second long side in the first periodic unit is at least partially adjacent to the third short side in the second periodic unit.

In an alternative implementation manner, in the second direction, any two subpixels with the same color and adjacent to each other constitute the first subpixel and the second subpixel.

In an optional implementation manner, the plurality of sub-pixels include a third sub-pixel and a fourth sub-pixel which are different in color and adjacent to each other, and a long side of an opening region of the third sub-pixel and a long side of an opening region of the fourth sub-pixel are at least partially adjacent to each other and parallel to each other.

In an optional implementation manner, the plurality of sub-pixels further include a fifth sub-pixel, colors of the third sub-pixel, the fourth sub-pixel, and the fifth sub-pixel are different from each other, and the third sub-pixel, the fourth sub-pixel, and the fifth sub-pixel are periodically and alternately arranged in sequence along a third direction.

In an optional implementation manner, orthographic projections of the opening region of the third sub-pixel, the opening region of the fourth sub-pixel and the opening region of the fifth sub-pixel in a fourth direction respectively completely overlap; wherein the fourth direction is perpendicular to the third direction.

In an alternative implementation, the shape of the open area is rectangular, parallelogram, oval, racetrack, oval, rounded rectangle or rounded parallelogram.

In an alternative implementation, the pixel density of the plurality of sub-pixels is greater than or equal to 200 PPI.

In an alternative implementation, the ratio between the length of the long side and the length of the short side of the opening area is greater than or equal to 2 and less than or equal to 5.

In an optional implementation manner, in an extending direction of the first long side, the first opening region includes a first line segment and a second line segment, and a distance between the first line segment and an opposite side is smaller than a distance between the second line segment and the opposite side; wherein the first line segment is adjacent to the first short side.

In an optional implementation manner, the first long side is further adjacent to a sixth sub-pixel, and a pixel definition layer height between the first opening region and the opening region of the sixth sub-pixel is different from a pixel definition layer height between the first opening region and the second opening region.

In an alternative implementation, the pixel defining layer disposed around the opening region includes a plurality of high-defining parts and a plurality of low-defining parts, the high-defining parts and the low-defining parts being alternately disposed at the periphery of the opening region; wherein the height of the high restriction portion is different from the height of the low restriction portion.

In an alternative implementation, the plurality of high limits includes a first high limit and a second high limit; the first height limiter and the second height limiter have different lengths in a direction surrounding the opening region.

In an alternative implementation, at least one of the plurality of high definition portions extends along a curve or a polyline in a direction around the open area.

In an alternative implementation, the pixel defining layer includes:

the first sub-limiting part is positioned between the opening areas of two adjacent sub-pixels with different colors;

the second sub-limiting part is positioned between the opening areas of the two adjacent sub-pixels with the same color;

wherein the first sub-confinement has a height greater than the height of the second sub-confinement.

In an alternative implementation, the first sub-definition portion includes a first material layer and a second material layer arranged in a stacked manner, the second material layer is located on a side of the first material layer facing away from the substrate base plate, the first material layer has a lyophilic property, and the second material layer has a lyophobic property; and/or the second sub-definition portion has lyophilic properties.

In an alternative embodiment, the first sub-delimitations have a curved or broken-line structure, and the second sub-delimitations are arranged between two adjacent first sub-delimitations.

In an alternative implementation, the first sub-definition has a height greater than or equal to 1 μm; and/or the height of the second sub-definition portion is greater than or equal to 0.05 μm and less than or equal to 0.5 μm.

The present disclosure provides a display device including any one of the display substrates.

The foregoing description is only an overview of the technical solutions of the present disclosure, and the embodiments of the present disclosure are described below in order that the technical means of the present disclosure may be clearly understood, and the foregoing and other objects, features, and advantages of the present disclosure may be more clearly understood.

Drawings

In order to more clearly illustrate the embodiments of the present disclosure or technical solutions in related arts, the drawings used in the description of the embodiments or related arts will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present disclosure, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts. It should be noted that the sizes and shapes of the figures in the drawings are not to be considered true scale, but are merely illustrative of the present invention. The same or similar reference numbers in the drawings identify the same or similar elements or elements having the same or similar functionality.

FIG. 1 schematically shows a film thickness profile in an opening region of a display substrate in the related art;

fig. 2 schematically shows a schematic plan view of a first display substrate;

FIG. 3 schematically illustrates a plan view of a second display substrate;

FIG. 4 schematically illustrates a cross-sectional view of a display substrate along AA';

FIG. 5 is a schematic cross-sectional view of a display substrate along BB';

FIG. 6 schematically illustrates a cross-sectional structure of a display substrate along CC';

fig. 7 schematically shows a plan view of a third display substrate;

fig. 8 schematically shows a plan view of a fourth display substrate;

fig. 9 schematically shows a plan structure view of a fifth display substrate;

fig. 10 schematically shows a plan structure view of a sixth display substrate;

FIG. 11 schematically illustrates a flow chart of steps of a method of manufacturing a display substrate;

FIG. 12 is a schematic cross-sectional view of a display substrate on which the first electrode layer is completed;

FIG. 13 schematically illustrates a cross-sectional structure of a display substrate on which the second sub-definition portion is completed;

FIG. 14 schematically illustrates a cross-sectional structure of a display substrate on which the first sub-definition portion is completed;

fig. 15 schematically shows a schematic cross-sectional structure of a display substrate on which preparation of a light-emitting functional layer is completed.

Detailed Description

To make the objects, technical solutions and advantages of the embodiments of the present disclosure more clear, the technical solutions of the embodiments of the present disclosure will be described clearly and completely with reference to the drawings in the embodiments of the present disclosure, and it is obvious that the described embodiments are some, but not all embodiments of the present disclosure. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.

In the field of light emitting devices, a solution process is usually adopted to prepare organic thin films such as a light emitting functional layer. Wherein the solution process includes, but is not limited to, ink jet printing, spin coating, screen printing, and transfer printing. During the solution process, the ink in the open area is prone to "climbing effect". The climbing effect refers to that at the position where the solution is contacted with the solid, the liquid level of the solution at the position close to the solid-liquid contact position is higher than that at the position far away from the solid-liquid contact position due to the influence of factors such as the characteristics of the solution and the surface tension. The climbing effect causes the thickness of the film close to the position of the retaining wall to be larger, and the uneven thickness of the film in the opening area further causes the uneven brightness of the pixel, thereby seriously affecting the display effect of the display substrate.

In the related art, the size of the open region has a large influence on the film thickness uniformity. Referring to fig. 1, a film thickness profile in the opening area is shown. The open area generally has long sides and short sides. In an ideal case, the film thickness in the open area is equal everywhere, and the width a of the long side of the open area is equal ₀ I.e. the theoretical long side width of the film, the short side width b of the open area ₀ I.e. the theoretical short side width of the film. However, in practical cases, the thickness of the thin film in the opening region is not uniform due to the influence of the process, the size of the opening region, the material, and the like, so that the actual long-side width a of the thin film having a thickness satisfying the uniformity requirement (e.g., a thickness of 20nm) is obtained ₁ Less than the theoretical long side width a ₀ Actual short side width b ₁ Less than the theoretical short side width b ₀ . According to the light emitting principle of the light emitting device, the actual width a of the long side of the film ₁ Should be infinitely close to the theoretical long side width a ₀ Actual short side width b ₁ Should be infinitely close to the theoretical short side width b ₀ . I.e. flatness a in the longitudinal direction ₁ /a ₀ And flatness b in the short side direction ₁ /b ₀ The larger the better, the infinite targetClose to 1.

The inventors found that the flatness of the film actually formed was not uniform in the long-side direction and the short-side direction, i.e., a ₁ /a ₀ Value of and b ₁ /b ₀ The values of (a) are different greatly under the same process conditions. For example, the film has a relatively uniform thickness in the longitudinal direction and a relatively good flatness; the thickness uniformity and flatness in the short side direction are poor. Therefore, increasing the size of the opening region in a certain direction contributes to improving the film thickness uniformity in that direction.

In order to solve the above problem, an embodiment of the present disclosure provides a display substrate including a plurality of sub-pixels. As shown in fig. 2 and 3, the plurality of sub-pixels may have a plurality of colors, for example, the plurality of sub-pixels may include a red sub-pixel R, a blue sub-pixel B, and a green sub-pixel G, which is not limited by the present disclosure.

As shown in fig. 2 and 3, the display substrate includes: a base substrate 21, and a pixel defining layer 22 disposed on one side of the base substrate 21. The pixel defining layer 22 is used to form an opening region O of a sub-pixel, the opening region O having long sides and short sides.

The plurality of sub-pixels includes a first sub-pixel P1 and a second sub-pixel P2 which are adjacent and have the same color. The opening region of the first sub-pixel P1 is a first opening region O1, and the first opening region O1 has a first long side La 1. The opening region of the second sub-pixel P2 is a second opening region O2, and the second opening region O2 has a first short side Lb 1.

The first long side La1 is at least partially adjacent to the first short side Lb1, and the height of the pixel defining layer between the first opening region O1 and the second opening region O2 is at least smaller than the height of other at least partial pixel defining layers.

The first sub-pixel P1 and the second sub-pixel P2 are two adjacent sub-pixels having the same color. The first long side La1 is one long side of the first opening region O1. The first short side Lb1 is one short side of the second opening region O2.

As shown in fig. 2 and 3, an angle θ between the long side of the first opening region O1 and the long side of the second opening region O2 may be greater than 0 ° and less than 180 °.

In the present disclosure, the height of the pixel defining layer between the first opening region O1 and the second opening region O2 is at least smaller than the height of other at least partial pixel defining layers, that is, a lower pixel defining layer is disposed between the first opening region O1 and the second opening region O2, so that ink can flow between the first opening region O1 and the second opening region O2.

Since the first and second sub-pixels P1 and P2 have the same color, when a thin film is formed in the opening region O using a solution process, ink of the same color can flow between the first and second opening regions O1 and O2. By arranging the first long side La1 adjacent to the first short side Lb1, the size of the first opening region O1 in the short side direction is increased in the adjacent region, the size of the second opening region O2 in the long side direction is increased, which is equivalent to the increase of the diffusion range of ink, so that the ink can be sufficiently diffused and well spread in a larger range, and therefore, the uniformity of the thickness and the flatness of the film inside the opening region and between the opening regions can be improved, the uniformity of brightness is improved, and the display effect of the display substrate is improved.

In addition, by arranging a lower pixel limiting layer between the first opening region O1 and the second opening region O2, the first opening region O1 and the second opening region O2 can be communicated with each other, so that the requirement on the dropping accuracy of ink in a solution process can be reduced, the tolerance on the dropping point of ink droplets is increased, and the process complexity is reduced.

Illustratively, the shape of the open area O may be a rectangle (as shown in fig. 2) or a rounded rectangle. In this case, the long sides of the rectangle are the long sides of the open region O, and the short sides of the rectangle are the short sides of the open region O.

Illustratively, the shape of the opening area O may be a parallelogram (as shown in fig. 3) or a rounded parallelogram. In this case, the long sides of the parallelogram are the long sides of the open region O, and the short sides of the parallelogram are the short sides of the open region O.

Illustratively, the shape of the opening region O may also be a waist circle (as shown in fig. 7). In this case, the long side of the minimum circumscribed rectangle of the oval shape is the long side of the opening region O, and the short side of the minimum circumscribed rectangle of the oval shape is the short side of the opening region O.

Illustratively, the shape of the opening region O may also be an ellipse (as shown in fig. 8). In this case, the long side of the minimum circumscribed rectangle of the ellipse is the long side of the opening region O, and the short side of the minimum circumscribed rectangle of the ellipse is the short side of the opening region O.

Illustratively, the shape of the opening region O may also be a racetrack shape. In this case, the long side of the minimum circumscribed rectangle of the racetrack shape is the long side of the opening region O, and the short side of the minimum circumscribed rectangle of the racetrack shape is the short side of the opening region O.

In practical applications, the shape of the opening region O may also be other polygons, rounded polygons, figures with curved sides, and so on. Accordingly, the long side of the opening region O may be the long side of the minimum bounding rectangle of the opening region O, and the short side of the opening region O may be the short side of the minimum bounding rectangle of the opening region O. The shape of the opening region O may be designed according to the actual application environment, and is not limited herein.

In a specific implementation, as shown in fig. 4 to 6, the display substrate may further include an organic material layer on a side of the pixel defining layer 22 facing away from the base substrate 21. The organic material layer may include at least one of the following layers: and a film layer such as a hole injection layer, a hole transport layer, a light-emitting functional layer 42, an electron transport layer, and an electron injection layer, which are stacked. The organic material layers in fig. 4 to 6 only show the light emitting function layer 42.

In order to realize electroluminescence, as shown in fig. 4 to 6, the display substrate described above may further include a first electrode 41 layer and a second electrode layer 43.

Wherein the first electrode 41 layer is located between the substrate base substrate 21 and the pixel defining layer 22. The first electrode 41 layer may include a plurality of first electrodes 41 disposed to be spaced apart from each other. The orthographic projection of the opening region O on the base substrate 21 may be located within the range of the orthographic projection of the first electrode 41 on the base substrate 21 at the corresponding position.

The light emitting function layer 42 may include a plurality of light emitting layers positioned in the opening region O. In order to realize color light emission, the light emission function layer 42 may include a first color light emission layer 421, a second color light emission layer 422, and a third color light emission layer 423, as shown in fig. 4. For example, the first color light emitting layer 421 may be a red light emitting layer, the second color light emitting layer 422 may be a green light emitting layer, and the third color light emitting layer 423 may be a blue light emitting layer.

In this embodiment, the sub-pixels having the same color are provided with the light emitting layers having the same emission color in the opening regions O of the sub-pixels. Since the first sub-pixel P1 has the same color as the second sub-pixel P2, a light emitting layer having the same color is provided in the first opening region O1 as in the second opening region O2.

As shown in fig. 4 to 6, the second electrode layer 43 is disposed on a side of the organic material layer facing away from the base substrate 21.

In the opening region O of each sub-pixel, the first electrode 41, the light-emitting layer, and the second electrode layer 43 form a laminated structure, thereby forming an electroluminescent diode.

Illustratively, the material of the light emitting layer may be an organic light emitting material, and accordingly, the electroluminescent diode is an organic light emitting diode. The material of the luminescent layer may also be quantum dots, and correspondingly, the electroluminescent diode is a quantum dot light emitting diode. The opening region O of the pixel defining layer 22 is a light emitting region of the sub-pixel where the electroluminescent diode is located.

In particular implementation, the display substrate may further include a transistor array layer (not shown) disposed between the first electrode 41 layer and the substrate 21. The transistor array layer may include a plurality of pixel circuits, and the first electrode 41 may be electrically connected to the pixel circuits to input a driving current to the first electrode 41 through the pixel circuits and apply a corresponding voltage to the second electrode layer 43, thereby driving the light emitting layer to emit light. Illustratively, the pixel circuit may include a storage capacitor and a transistor electrically connected to the storage capacitor. For example, the pixel circuit may be a 2T1C pixel circuit, a 3T1C pixel circuit, or a 7T1C pixel circuit, or the like. Wherein, the 2T1C pixel circuit comprises 2 transistors and 1 storage capacitor; the 3T1C pixel circuit includes 3 transistors and 1 storage capacitor; the 7T1C pixel circuit includes 7 transistors and 1 storage capacitor.

In an alternative implementation, as shown in fig. 2 and 3, an orthographic projection of the second opening region O2 in the first direction F1 is located within an orthographic projection range of the first opening region O1 in the first direction F1.

Wherein the first direction F1 is perpendicular to the long sides of the second opening region O2.

The present implementation may maximally increase an overlapping range between orthographic projections of the first opening region O1 and the second opening region O2 in the first direction F1, respectively, to maximize an area of the adjacent regions, so that a film flatness within the opening region may be maximally improved.

In an alternative implementation, the included angle θ between the first long side La1 and the long side of the second opening region O2 is greater than or equal to 45 ° and less than or equal to 135 °.

Specifically, the long sides of the second opening region O2 include a second long side La2 and a third long side La 3. An angle θ between the first long side La1 and the long side of the second opening region O2, that is, an angle θ between the first long side La1 and the second long side La2, or an angle θ between the first long side La1 and the third long side La 3.

Further, the included angle θ may be greater than or equal to 70 ° and less than or equal to 110 °.

Alternatively, the included angle may be 90 ° as shown in fig. 2. When the included angle θ is set to 90 °, the pixel structure design can be simplified.

Alternatively, the included angle θ may be an obtuse angle, such as 120 °, as shown in fig. 3, in which case the orthographic projection shape of the pixel unit formed by the red sub-pixel R, the blue sub-pixel B and the green sub-pixel G on the substrate is closer to a square, so that the image displayed by the display device is effectively prevented from being deformed or the displayed image scale is not consistent.

Alternatively, the first long side La1 and the first short side Lb1 are parallel to each other. That is, the extending direction of the first long side La1 and the extending direction of the first short side Lb1 are parallel to each other.

As shown in fig. 2 and 3, since the first long side La1 and the first short side Lb1 are parallel to each other, it is possible to ensure that the first opening region O1 is uniform throughout the extension in the short side direction and the second opening region O2 is uniform throughout the extension in the long side direction in the adjacent region, so that the uniformity of the film thickness can be further improved.

Alternatively, the first opening region O1 has a second short side Lb2, the second opening region O2 has a second long side La2, and the second long side La2 and the second short side Lb2 are parallel to each other or are located on the same straight line (as shown in fig. 2 and 3).

When the second long side La2 and the second short side Lb2 are located on the same straight line, the space on the display substrate can be fully utilized, which is helpful for improving the pixel density of the display substrate and the aperture ratio of the sub-pixels.

In an alternative implementation, the first opening region O1 has a second short side Lb2 and a third short side Lb3 opposite to each other, the second opening region O2 has a second long side La2 and a third long side La3 opposite to each other, and a distance between the second short side Lb2 and the second long side La2 is smaller than or equal to a distance between the third short side Lb3 and the third long side La 3. In fig. 2 and 3, since the second short side Lb2 and the second long side La2 are located on the same straight line, the distance therebetween is 0.

The first sub-pixel P1 and the second sub-pixel P2 form a periodic unit, a plurality of periodic units are periodically arranged along the second direction F2, two adjacent periodic units include a first periodic unit C1 and a second periodic unit C2, and the second long side La2 of the first periodic unit C1 is at least partially adjacent to the third short side Lb3 of the second periodic unit C2.

As shown in fig. 2 and 3, the first sub-pixel P1 and the second sub-pixel P2 are periodically and alternately arranged in turn in the second direction F2. Each of the period units includes a first subpixel P1 and a second subpixel P2.

The second subpixel P2 in the first periodic unit C1 is adjacent to the first subpixel P1 in the second periodic unit C2. Specifically, the second long side La2 of the second opening region O2 in the first periodic unit C1 is adjacent to the third short side Lb3 of the first opening region O1 in the second periodic unit C2.

Alternatively, in the second direction F2, any two subpixels, which are the same in color and adjacent, constitute the first subpixel P1 and the second subpixel P2.

As shown in fig. 2 and 3, in the second direction F2, the extension directions of the long sides of two adjacent sub-pixels having the same arbitrary color are different, and the long side of the opening region O of one sub-pixel is adjacent to the short side of the opening region O of the other sub-pixel.

As shown in fig. 2 and 3, since the second subpixel P2 in the first period cell C1 is adjacent to and has the same color as the first subpixel P1 in the second period cell C2, the second subpixel P2 in the first period cell C1 may also constitute a first subpixel in a certain period cell Ci, and the first subpixel P1 in the second period cell C2 may also constitute a second subpixel in the period cell Ci.

As shown in fig. 2, in the second direction F2, the included angle θ between the long sides of any two adjacent sub-pixel opening areas O of the same color is 90 °. As shown in fig. 3, in the second direction F2, an included angle θ between long sides of any two adjacent sub-pixel opening regions O having the same color is an obtuse angle.

Since any two subpixels, which are the same in color and adjacent, constitute the first subpixel P1 and the second subpixel P2 in the second direction F2, and since ink can flow between the opening regions of the first subpixel P1 and the second subpixel P2, ink can flow between all subpixels, which are the same in color, arranged in the second direction F2, thereby further improving the uniformity of the film thickness between pixels.

In an alternative implementation, as shown in fig. 2 and 3, the plurality of sub-pixels includes a third sub-pixel P3 and a fourth sub-pixel P4, which are different in color and adjacent to each other, and a long side of the opening region O of the third sub-pixel P3 is at least partially adjacent to and parallel to a long side of the opening region O of the fourth sub-pixel P4.

As shown in fig. 2 and 3, the third and fourth sub-pixels P3 and P4 are arranged in the third direction F3. The long side of the opening region O of the third subpixel P3 and the long side of the opening region O of the fourth subpixel P4 are parallel to and at least partially adjacent to each other.

Alternatively, as shown in fig. 2 and 3, the short sides of the third and fourth sub-pixels P3 and P4 are parallel to each other.

As shown in fig. 2 and 3, any adjacent two subpixels among the plurality of subpixels arranged in the third direction F3 may constitute the third subpixel P3 and the fourth subpixel P4. The long sides of the open regions O of the plurality of sub-pixels arranged in the third direction F3 are parallel to each other, and the short sides of the open regions O of the plurality of sub-pixels arranged in the third direction F3 are parallel to each other.

Optionally, the plurality of sub-pixels may further include a fifth sub-pixel P5, colors of the third sub-pixel P3, the fourth sub-pixel P4 and the fifth sub-pixel P5 are different from each other, and the third sub-pixel P3, the fourth sub-pixel P4 and the fifth sub-pixel P5 are alternately arranged periodically along the third direction F3 in sequence.

Wherein, the color of the third sub-pixel P3 may be red, green or blue. The color of the fourth sub-pixel P4 may be red, green, or blue. The color of the fifth subpixel P5 may be red, green or blue. The colors of the third, fourth and fifth sub-pixels P3, P4 and P5 are different from each other.

Alternatively, the orthographic projections of the opening region O of the third sub-pixel P3, the opening region O of the fourth sub-pixel P4, and the opening region O of the fifth sub-pixel P5 in the fourth direction F4, respectively, completely overlap. The fourth direction F4 is perpendicular to the third direction F3.

In the present embodiment, the fourth direction F4 may be the same as the second direction F2, for example, as shown in fig. 2 and 3, the third direction F3 may be a pixel row direction, and the second direction F2 and the fourth direction F4 may be a pixel column direction. Alternatively, the third direction F3 may be a pixel column direction, and the second and fourth directions F2 and F4 may be a pixel row direction. These may be designed and determined according to the requirements of practical application, and are not limited herein.

In fig. 2 and 3, the extending direction of the sub-pixels arranged in the row direction intersects with the row direction. The extending directions of two adjacent sub-pixels in the same row are the same and the colors of the two adjacent sub-pixels are different. The extending directions of two sub-pixels respectively positioned in adjacent rows are different. The extending direction of the sub-pixel refers to the long side direction of the opening region of the sub-pixel.

As shown in fig. 2 and 3, the long sides of the sub-pixel opening regions O located in two adjacent rows are arranged in a fishbone shape.

Alternatively, the shape of the open area may be rectangular, parallelogram, oval, racetrack, oval, rounded rectangular or rounded parallelogram. The shapes of the opening regions O of the respective sub-pixels may be the same or different.

As shown in fig. 2, the opening region O of each sub-pixel is rectangular in shape; as shown in fig. 3, the opening region O of each sub-pixel has a parallelogram shape.

In an alternative implementation, referring to fig. 9, in the extending direction of the first long side La1, the first opening region O1 may include a first line segment n1 and a second line segment n2, and a distance d1 between the first line segment n1 and the opposite side is smaller than a distance d2 between the second line segment n2 and the opposite side.

To improve the flatness of the film layer in the entire opening area, the first line segment n1 may be disposed adjacent to the first short side Lb 1.

In this embodiment, the long side of the opening region O is the long side of the minimum circumscribed rectangle of the opening region O, and the short side of the opening region O is the short side of the minimum circumscribed rectangle of the opening region O.

The first line segment n1 and the second line segment n2 may be straight line segments, curved line segments, or the like.

When the first line segment n1 and the second line segment n2 are straight line segments, the shape of the opening region O is a convex shape (as illustrated in fig. 9) or a rounded convex shape. In this case, the long side of the minimum circumscribed rectangle of the convex shape is the long side of the opening region O, and the short side of the minimum circumscribed rectangle of the convex shape is the short side of the opening region O. Wherein the glyphs can be symmetrical or asymmetrical (as shown in figure 9).

When the first line segment n1 and the second line segment n2 are curved line segments, the shape of the opening region O resembles a gourd shape. In this case, the long side of the minimum bounding rectangle of the gourd shape is the long side of the opening region O, and the short side of the minimum bounding rectangle of the gourd shape is the short side of the opening region O. Wherein, the gourd shape can be symmetrical or asymmetrical.

When the first line segment n1 and the second line segment n2 are curved line segments, the first line segment n1 and the second line segment n2 may be line segments of the first opening region O1 whose extending direction is closest to the extending direction of the first long side La 1.

Since the distance d1 between the first line segment n1 and the opposite edge is smaller than the distance d2 between the second line segment n2 and the opposite edge, i.e., the region between the first line segment n1 and the opposite edge thereof corresponds to the narrow port region, and the region between the second line segment n2 and the opposite edge thereof corresponds to the wide port region. When the solution is applied, the ink can be dripped in the wide opening area, so that the requirement on the dripping precision of the ink can be reduced, the tolerance on the dripping point of the ink is increased, and the process complexity is reduced.

The inventors found that, as the resolution of the display substrate is improved, the thickness non-uniformity of the thin film formed inside the opening region O is more significant due to the reduction in the size of the opening region O. When the pixel density of the plurality of sub-pixels is greater than or equal to 200PPI, the thickness uniformity of the thin film can be remarkably improved, and the effect of improving the thickness uniformity of the thin film is more obvious along with the improvement of the pixel density.

Optionally, the ratio of the length of the long side to the length of the short side of the opening region O is greater than or equal to 2, and is less than or equal to 5, which may be determined according to practical effects, and this disclosure does not limit this.

Taking the first opening region O1 as an example, as shown in fig. 2 and 3, the long side of the first opening region O1 is La1, and the short side is Lb2, that is, the ratio between the length of La1 and the length of Lb2 is greater than or equal to 2 and less than or equal to 5.

Taking the second opening region O2 as an example, as shown in fig. 2 and 3, the long side of the second opening region O2 is La2, and the short side is Lb1, that is, the ratio between the length of La2 and the length of Lb1 is greater than or equal to 2 and less than or equal to 5.

Alternatively, referring to fig. 2, the first long side La1 is also adjacent to the sixth subpixel P6, and the height of a pixel defining layer between the first opening region O1 and the opening region O of the sixth subpixel P6 is different from the height of a pixel defining layer between the first opening region O1 and the second opening region O2.

That is, the pixel defining layer height between the first opening region O1 and the opening region O of the sixth sub-pixel P6 is different from the pixel defining layer height between the first opening region O1 and the second opening region O2.

As shown in fig. 2, the first long side La1 is adjacent to the second sub-pixel P2 and the sixth sub-pixel P6, respectively. Specifically, the first long side La1 is adjacent to the first short side Lb1 of the opening region of the second subpixel P2. The first long side La1 is adjacent to the long side of the opening region of the sixth subpixel P6.

The color of the first sub-pixel P1 and the color of the second sub-pixel P2 may be the same, and the color of the first sub-pixel P1 and the color of the sixth sub-pixel P6 may be different. Accordingly, a pixel defining layer height between the first opening region O1 and the opening region of the sixth subpixel P6 may be greater than a pixel defining layer height between the first opening region O1 and the second opening region O2.

In the present disclosure, the first sub-pixel P1 may be any sub-pixel in the display substrate. In some examples, the first sub-pixel is a non-edge sub-pixel, which is not limited by this disclosure. The edge sub-pixel is a sub-pixel close to the edge of the display substrate.

In an alternative implementation, as shown in fig. 2, the pixel defining layer 22 disposed around the opening region O may include a plurality of high defining parts 22H and a plurality of low defining parts 22L, the high defining parts 22H and the low defining parts 22L being alternately disposed at the periphery of the opening region O.

The height of the high restriction portion 22H is different from that of the low restriction portion 22L, and the height of the high restriction portion 22H may be larger than that of the low restriction portion 22L.

Illustratively, as shown in fig. 2, two high-definition portions 22H and two low-definition portions 22L may be provided around the opening region O, the two high-definition portions 22H and the two low-definition portions 22L being provided around the periphery of the opening region in the order of the high-definition portions 22H, the low-definition portions 22L, the high-definition portions 22H, and the low-definition portions 22L.

Alternatively, referring to fig. 2, the plurality of high restrictions 22H may include a first high restriction 22H1 and a second high restriction 22H 2. The lengths of the first and second high restrictions 22H1 and 22H2 may be different in the direction surrounding the opening area O.

Alternatively, referring to fig. 2, at least one of the plurality of high restrictions 22H extends along a curved line or a broken line in a direction surrounding the opening area.

Illustratively, as shown in fig. 2, the plurality of high-limit portions 22H includes a first high-limit portion 22H1 and a second high- limit portion 22H 2. Wherein the first height restriction portion 22H1 extends along a fold line in a direction surrounding the opening area. The second height restriction portions 22H2 extend in a straight line in a direction surrounding the opening area. The length of the first height limiter 22H1 is greater than the length of the second height limiter 22H 2.

The opening region in this implementation may not be an opening region of an edge sub-pixel, which is not limited by this disclosure.

Alternatively, the opening region O for each non-edge sub-pixel may include four sides, such as two opposite short sides and two opposite long sides. One of the long sides (e.g., the first long side La1 of the first opening region O1 in fig. 2) may be adjacent to two sub-pixels, one of the two sub-pixels (e.g., the second sub-pixel P2 in fig. 2) may be the same color as the sub-pixel (e.g., the first sub-pixel P1 in fig. 2), and the other (e.g., the sixth sub-pixel P6 in fig. 2) may be different color from the sub-pixel (e.g., the first sub-pixel P1 in fig. 2). The other long side (e.g., the opposite side of the first long side La1 of the first opening region O1 in fig. 2) may be adjacent to two sub-pixels, which (e.g., the third sub-pixel P3 and the seventh sub-pixel P7 in fig. 2) may have the same color and a different color from the sub-pixel (e.g., the first sub-pixel P1 in fig. 2). One of the short sides (e.g., the second short side Lb2 in fig. 2) may be adjacent to a sub-pixel having the same color, and the other short side (e.g., the third short side Lb3 in fig. 2) may be adjacent to a sub-pixel having a different color.

As shown in fig. 2 and 3, each non-edge sub-pixel may be adjacent to 6 sub-pixels, which is not limited by this disclosure.

In an alternative implementation, as shown in fig. 2 to 6, the pixel defining layer 22 may include: the first sub-defining portion 221 is located between the opening regions O of two adjacent sub-pixels having different colors.

The pixel defining layer 22 may further include: the second sub-defining portion 222 is located between the opening regions O of two adjacent sub-pixels having the same color.

Wherein the height H1 of the first sub-defining part 221 may be greater than the height H2 of the second sub-defining part 222.

Thus, the higher first sub-limiting portion 221 can prevent the overflow color mixing between the inks of the sub-pixels with different colors, and the lower second sub-limiting portion 222 can make the inks mutually diffuse between the sub-pixels with the same color, thereby improving the film uniformity inside the pixel and between the pixels, and further improving the brightness uniformity and the display effect.

Alternatively, as shown in fig. 4 to 6, the first sub-defining part 221 may include a first material layer 44 and a second material layer 45 arranged in a stack, the second material layer 45 being located on a side of the first material layer 44 facing away from the base substrate 21.

Wherein the first material layer 44 has lyophilic properties and the second material layer 45 has lyophobic properties.

By disposing the first material layer 44 having lyophilic properties on the side close to the substrate, in the inkjet printing process, the ink can be uniformly spread over the entire opening region O due to the strong attraction of the bottom lyophilic material layer to the ink, thereby improving the flatness of the film layer in the opening region O. Through setting up the second material layer 45 that has lyophobic property in the one side of keeping away from substrate base plate 10, the lyophobic material at top has the repulsion effect to the ink, can reduce the climbing height of ink effectively on the one hand, and on the other hand can avoid taking place the overflow and then cause the colour mixture between the sub-pixel of different colours.

In a specific implementation, fluorine-containing substances may be doped or bonded into a host material such as a polyimide-based material or a polymethylmethacrylate-based material, and a coating process, a pre-baking process, an exposure process, a developing process, and the like are sequentially performed to make the top of the host material have a lyophobic property, thereby forming the structure of the first sub-confinement section 221.

Optionally, the second sub-definition portion 222 has lyophilic properties. By providing the second sub-limiting portion 222, on one hand, the edge step of the first electrode 41 can be covered, and leakage breakdown is avoided; on the other hand, since the second sub-defining portion 222 has lyophilic properties, the fluidity of ink between sub-pixels of the same color can be effectively improved, so that the film thickness uniformity between sub-pixels of the same color can be improved.

In a specific implementation, the material of the second sub-definition portion 222 may include fluorine-free photoresist such as polyimide-based material or polymethyl methacrylate-based material.

Alternatively, the first sub defining portion 221 has a curved line structure or a polygonal line structure. As shown in fig. 2 and 3, the first sub defining portion 221 extends along a broken line in the column direction, i.e., the first sub defining portion 221 has a broken line structure. The pixel defining layer may include a plurality of the first sub-defining parts 221 of a polygonal line structure.

Alternatively, the second sub-defining portion 222 is disposed between adjacent two of the first sub-defining portions. As shown in fig. 2 and 3, a plurality of second sub-defining portions 222 are provided at intervals between two adjacent zigzag line structures.

Alternatively, the height H1 of the first sub-defining part 221 is greater than or equal to 1 μm.

Alternatively, the height H2 of the second sub-defining portion 222 is greater than or equal to 0.05 μm and less than or equal to 0.5 μm.

As shown in fig. 2 and 3, the plurality of first sub-defining portions 221 arranged in the second direction are of an integral structure. The second sub-defining portions 222 are discontinuous structures arranged at intervals.

Fig. 4 is a schematic view of a cross-sectional structure of a display substrate along AA' according to an exemplary embodiment of the present disclosure. Fig. 5 is a schematic view of a cross-sectional structure of a display substrate along BB' according to an exemplary embodiment of the present disclosure. Fig. 6 is a schematic cross-sectional structure of a display substrate along CC according to an exemplary embodiment of the present disclosure.

In a specific implementation, as shown in fig. 10, the display substrate may include a display region E1 and a non-display region E2, and in order to avoid the display substrate provided by the present disclosure generating a saw-tooth effect at the boundary of the display region E1 and the non-display region E2, the orthographic projection of the first electrode 41 layer on the substrate 21 may be disposed within the display region E1. Specifically, the orthographic projection boundary of the first electrode 41 layer on the base substrate 21 may be set to coincide with the boundary of the display area E1.

Alternatively, the display substrate may include an inner subpixel PA and an edge subpixel PB. The opening area of the inner subpixel PA is entirely located in the display area E1. The opening region of the edge subpixel PB is partially located in the display region E1 and partially located in the non-display region E2. An orthographic projection of the first electrode 41 of the edge sub-pixel PB on the substrate base 21 (as indicated by a dashed box at the position of the edge sub-pixel PB in fig. 10) may cover an opening area located within the display area E1 and have no overlap with the non-display area E2.

Further, in order to prevent the brightness of the edge sub-pixel PB from being inconsistent with the brightness of the inner sub-pixel PA, the driving current of the edge sub-pixel PB can be input through an independent signal lead, so that the display brightness of the edge sub-pixel PB can be consistent with the display brightness of the inner sub-pixel PA by independently adjusting the driving current.

It should be understood by those skilled in the art that, unless otherwise specified, the "thickness" and "height" refer to the dimension of the corresponding film layer along the direction perpendicular to the plane of the substrate base plate, i.e., along the light-emitting direction of the display base plate.

In an actual process, the same features may not be completely the same due to limitations of process conditions or other factors, and some variations may occur, so that the same relationship between the features is only required to substantially satisfy the above conditions, and thus the protection scope of the present disclosure is included. For example, the above-described identity may be the same as allowed within an error allowable range.

The present disclosure also provides a display device including the display substrate provided in any one of the embodiments.

Those skilled in the art will appreciate that the display device has the advantages of the front display substrate.

The display device in this embodiment may be: any product or component with a 2D or 3D display function, such as a display panel, electronic paper, a mobile phone, a tablet computer, a television, a notebook computer, a digital photo frame, a navigator and the like.

The disclosure also provides a method for manufacturing a display substrate, wherein the display substrate comprises a plurality of sub-pixels. As shown in fig. 11, the preparation method includes:

step S01: a base substrate is provided.

Step S02: a pixel defining layer formed at one side of the substrate, the pixel defining layer for forming an opening region of the sub-pixel, the opening region having a long side and a short side; the plurality of sub-pixels comprise a first sub-pixel and a second sub-pixel which are same in color and adjacent to each other, an opening area of the first sub-pixel is a first opening area, the first opening area is provided with a first long side, an opening area of the second sub-pixel is a second opening area, and the second opening area is provided with a first short side; the first long side is at least partially adjacent to the first short side, and the height of the pixel defining layer between the first opening area and the second opening area is at least smaller than that of other at least partial pixel defining layers.

The display substrate provided in any of the above embodiments can be prepared by the preparation method provided in this embodiment.

The following describes in detail a method for manufacturing a display substrate according to an embodiment of the present disclosure with reference to fig. 12 to 15 and fig. 4.

The preparation method of the display substrate provided by the embodiment of the disclosure can comprise the following steps:

(1) a base substrate 21 is provided.

(2) Forming a pattern of a plurality of first electrodes 41 spaced apart from each other on one side of the base substrate 21; as shown in fig. 12.

(3) Forming a second sub-defining portion 222 on the base substrate 21 on which the first electrode 41 is formed; as shown in fig. 13.

(4) The first sub-defining portion 221 is formed on the substrate base 21 where the second sub-defining portion 222 is formed, as shown in FIG. 14. Wherein the second sub-defining portion 222 has a second height H2 in the direction perpendicular to the plane of the substrate base 21, the first sub-defining portion 221 has a first height H1 in the direction perpendicular to the plane of the substrate base 21, and the first height H1 is greater than the second height H2. The first sub-defining part 221 and the second sub-defining part 222 collectively define a plurality of opening regions O.

(5) Spraying the luminescent layer material into each opening region O by adopting an ink-jet printing process, thereby forming luminescent layers with different colors and forming a luminescent functional layer 42; as shown in fig. 15.

(6) Forming a second electrode layer 43 on a side of the light-emitting functional layer 42 away from the base substrate 21; as shown in fig. 4. The second electrode layer 43 may have a full-surface structure covering the base substrate 21.

The embodiments in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

Finally, it should also be noted that, unless otherwise defined, the terms "first," "second," and the like, as used herein do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in the process, method, article, or apparatus that comprises the element. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

The display substrate and the display device provided by the present disclosure are described in detail above, and the principles and embodiments of the present disclosure are explained herein by applying specific examples, and the descriptions of the above examples are only used to help understanding the method and the core ideas of the present disclosure; meanwhile, for a person skilled in the art, according to the idea of the present disclosure, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present disclosure.

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

It will be understood that the present disclosure is not limited to the precise arrangements that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Reference herein to "one embodiment," "an embodiment," or "one or more embodiments" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present disclosure. Moreover, it is noted that instances of the word "in one embodiment" are not necessarily all referring to the same embodiment.

In the description provided herein, numerous specific details are set forth. However, it is understood that embodiments of the disclosure may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.

In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The disclosure may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means can be embodied by one and the same item of hardware. The usage of the words first, second and third, etcetera do not indicate any ordering. These words may be interpreted as names.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solutions of the present disclosure, not to limit them; although the present disclosure has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present disclosure.

Claims

1. A display substrate comprising a plurality of sub-pixels, the display substrate comprising:

a substrate base plate, and a pixel defining layer disposed at one side of the substrate base plate, the pixel defining layer being used to form an opening region of the sub-pixel, the opening region having a long side and a short side;

2. The display substrate according to claim 1, wherein an orthographic projection of the second opening region in a first direction is within an orthographic projection range of the first opening region in the first direction;

wherein the first direction is perpendicular to the long side of the second opening region.

3. The display substrate of claim 1, wherein an angle between the first long side and the long side of the second opening region is greater than or equal to 45 ° and less than or equal to 135 °.

4. The display substrate of claim 3, wherein the included angle is greater than or equal to 70 ° and less than or equal to 110 °.

5. The display substrate of claim 1, wherein the first long side and the first short side are parallel to each other.

6. The display substrate of claim 1, wherein the first opening region has a second short side, and the second opening region has a second long side, and the second long side and the second short side are parallel to each other or are located on the same line.

7. The display substrate of claim 1, wherein the first opening region has a second short side and a third short side which are opposite to each other, the second opening region has a second long side and a third long side which are opposite to each other, and a distance between the second short side and the second long side is smaller than or equal to a distance between the third short side and the third long side;

8. The display substrate according to claim 7, wherein any two subpixels having the same color and being adjacent constitute the first subpixel and the second subpixel in the second direction.

9. The display substrate according to claim 1, wherein the plurality of sub-pixels comprise third and fourth sub-pixels which are different in color and adjacent to each other, and a long side of an opening region of the third sub-pixel and a long side of an opening region of the fourth sub-pixel are at least partially adjacent to each other and parallel to each other.

10. The display substrate according to claim 9, wherein the plurality of sub-pixels further comprises a fifth sub-pixel, the third sub-pixel, the fourth sub-pixel and the fifth sub-pixel have different colors, and the third sub-pixel, the fourth sub-pixel and the fifth sub-pixel are periodically and alternately arranged along a third direction in sequence.

11. The display substrate according to claim 10, wherein orthographic projections of the opening region of the third sub-pixel, the opening region of the fourth sub-pixel and the opening region of the fifth sub-pixel in a fourth direction respectively completely overlap; wherein the fourth direction is perpendicular to the third direction.

12. The display substrate of claim 1, wherein the shape of the open region is a rectangle, a parallelogram, a kidney circle, a racetrack, an ellipse, a rounded rectangle, or a rounded parallelogram.

13. The display substrate of claim 1, wherein the plurality of subpixels has a pixel density greater than or equal to 200 PPI.

14. The display substrate of claim 1, wherein a ratio between a length of a long side and a length of a short side of the opening region is greater than or equal to 2 and less than or equal to 5.

15. The display substrate according to claim 1, wherein the first opening region includes a first line segment and a second line segment in an extending direction of the first long side, and a distance between the first line segment and an opposite side is smaller than a distance between the second line segment and an opposite side; wherein the first line segment is adjacent to the first short side.

16. The display substrate according to any one of claims 1 to 15, wherein the first long side is further adjacent to a sixth subpixel, and a pixel definition layer height between the first opening region and the opening region of the sixth subpixel is different from a pixel definition layer height between the first opening region and the second opening region.

17. The display substrate according to any one of claims 1 to 15, wherein the pixel defining layer disposed around the opening region includes a plurality of high-definition portions and a plurality of low-definition portions, the high-definition portions and the low-definition portions being alternately disposed at a periphery of the opening region; wherein the height of the high restriction portion is different from the height of the low restriction portion.

18. The display substrate of claim 17, wherein the plurality of height-restricting portions includes a first height-restricting portion and a second height-restricting portion; the first height limiter and the second height limiter have different lengths in a direction surrounding the opening region.

19. The display substrate of claim 17, wherein at least one of the plurality of high definition portions extends along a curve or a fold line in a direction around the open area.

20. The display substrate of any one of claims 1 to 15, wherein the pixel defining layer comprises:

21. The display substrate of claim 20, wherein the first sub-definition portion comprises a first material layer and a second material layer in a stacked arrangement, the second material layer being located on a side of the first material layer facing away from the substrate, the first material layer having lyophilic properties, the second material layer having lyophobic properties; and/or the second sub-definition portion has lyophilic properties.

22. The display substrate according to claim 20, wherein the first sub-defining portions have a curved line structure or a broken line structure, and the second sub-defining portions are disposed between adjacent two of the first sub-defining portions.

23. The display substrate of claim 20, wherein the first sub-definition portion has a height greater than or equal to 1 μ ι η; and/or the height of the second sub-limiting portion is greater than or equal to 0.05 μm and less than or equal to 0.5 μm.

24. A display device comprising the display substrate of any one of claims 1 to 23.